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CVE-2026-74939

🗓️ 18 Aug 2026 12:23:28Reported by mozillaType 
cve
 cve
🔗 web.nvd.nist.gov👁 170 Views🌐 WEB

Privilege escalation in Firefox DOM: Navigation component, fixed in Firefox 154 and ESR versions 115.39, 140.14, 153.1.

Related
Detection
Affected
Refs
Paths
NVD
Node
OR
mozillafirefoxRange<115.39.0
mozillafirefoxRange116.0–140.14.0
mozillafirefoxRange141.0–153.1.0
mozillathunderbirdRange<140.14.0
mozillathunderbirdRange141.0–153.1.0
[
  {
    "product": "Firefox",
    "vendor": "Mozilla",
    "versions": [
      {
        "status": "unaffected",
        "version": "115.39",
        "lessThanOrEqual": "115.*",
        "versionType": "rpm"
      },
      {
        "status": "unaffected",
        "version": "140.14",
        "lessThanOrEqual": "140.*",
        "versionType": "rpm"
      },
      {
        "status": "unaffected",
        "version": "153.1",
        "lessThanOrEqual": "153.*",
        "versionType": "rpm"
      },
      {
        "status": "unaffected",
        "version": "154",
        "lessThanOrEqual": "*",
        "versionType": "rpm"
      }
    ]
  },
  {
    "product": "Thunderbird",
    "vendor": "Mozilla",
    "versions": [
      {
        "status": "unaffected",
        "version": "140.14",
        "lessThanOrEqual": "140.*",
        "versionType": "rpm"
      },
      {
        "status": "unaffected",
        "version": "153.1",
        "lessThanOrEqual": "153.*",
        "versionType": "rpm"
      },
      {
        "status": "unaffected",
        "version": "154",
        "lessThanOrEqual": "*",
        "versionType": "rpm"
      }
    ]
  }
]
ParameterPositionPathDescriptionCWE
RemoteTypeOverridepathabout:blankPrivilege escalation by forcing navigation of a content load to a privileged process via a RemoteTypeOverride override (privilegedabout) in nsDocShellLoadState carried over PDocumentChannel; loads about:blank into a privileged process.CWE-269
URIpathabout:blankPrivilege escalation by forcing navigation of a content load to a privileged process via a RemoteTypeOverride override (privilegedabout) in nsDocShellLoadState carried over PDocumentChannel; loads about:blank into a privileged process.CWE-269

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21 Aug 2026 04:18Current
6.1Medium risk
Vulners AI Score6.1
CVSS 3.18.8
EPSS0.00454
SSVC
170